Effects of monomers on the properties of palm-oil-based radiation curable pressure sensitive adhesives (PSA) — a prepolymer method

• Published in: Radiation physics and chemistry (Oxford, England : 1993) Vol. 60; no. 1; pp. 129 - 137
• Main Authors: Hilmi Mahmood, Mohd, Abdullah, Zahid, Sakurai, Yasuo, Zaman, Khairul, Mohd. Dahlan, Hj
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 2001
• Subjects: Monomers; Palm oil; Prepolymer; Pressure sensitive adhesives; Radiation curable; Pressure sensitive adhesives; Palm oil; Prepolymer; Radiation curable; Monomers
• ISSN: 0969-806X; 1879-0895
• DOI: 10.1016/S0969-806X(00)00310-8

Various low glass transition temperature ( T g) acrylate and methacrylate monomers were mixed with epoxidised palm oil acrylate (EPOLA) with the ratio of 50/50 prior to curing with electron beam (EB) irradiation. Methacrylate monomers such as dicyclopentenyloxyethyl methacrylate (DCPOEMA) and isobornyl methacrylate (ISBMA), although displaying relatively high adhesive properties were finally excluded from being further utilised as monomers for PSA because of a very slow curing speed. Literally, it is suggested that poorer adhesive performances of the cured films made from 50/50 : EPOLA/monomer mixture as compared to that of 100% monomer was attributed to the lack of compatibility between EPOLA and the particular monomers. Further compatibility investigations were continued using formulations prepared via the prepolymer route cured by ultraviolet (UV) irradiation and the results showed that several monoacrylate monomers with polar and non-polar groups exhibited high curing speed as well as good compatibility with EPOLA as shown by their cured film properties such as surface tackiness, peel adhesion and creep resistance. It is also suggested that these monomers were acting as surfactants for EPOLA which consequently enhance their compatibility upon mixing.